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We explore the robustness of the calibration of stellar models achievablewith Ai Phe binary system. By means of the SCEPtER pipeline, we investigatedthe impact of different assumptions about the surface efficiency of microscopicdiffusion. In the reference scenario, we allowed modification of the surfacemetallicity due to microscopic diffusion, while in the alternative scenario weassumed that competing mixing from other sources cancels out this effect. Dueto the fact that the primary star has already experienced the first dredge-upwhile the secondary has not, the tested scenarios show interesting differences.While the estimated age is quite robust ($4.70^{+0.13}_{-0.14}$ Gyr and$4.62^{+0.13}_{-0.06}$ Gyr), the calibration of the convective coreovershooting parameter $\beta$ reveals noticeable differences. The referencescenario suggests a wide multi-modal range of possible values of $\beta$ around0.10; the alternative scenario computations point towards a sharp and lower$\beta$, around 0.04. The impossibility to obtain an unambiguous fit confirmsthe difficulty in achieving a sensible calibration of the free parameters ofstellar models using binary systems, even when very accurate masses and radiiare available.

Stellar model calibrations with the Ai Phe binary system. Open questions about the robustness of the fit